@POST
  @Path("/leave")
  @Consumes("application/json")
  @Produces("application/json")
  public Response leaveDebate(PolarizedDebater debater) {

    PolarizedDebaterDAO debaterDAO = new PolarizedDebaterDAO();
    ResponseBuilder builder;

    debater.setIsValid(false);
    debaterDAO.update(debater);

    builder = Response.status(Response.Status.OK);

    return builder.build();
  }